The power master series on-line ups systems from streamline power systems provide clean power and protection to costly equipments. These on-line ups systems are state-of-art double conversion type and employ high frequency pwm technique and mosfet/igbt as main switching device for inverters. These ups systems are technically superior to other conventional ups systems giving pure sine wave output. The power master series ups systems have been useful for almost all applications and have been found extremely reliable and consistent in delivering optimum performance. Some of the salient features of these on-line ups systems include high frequency pwm, using igbt/mosfet; rtwc and vlsi/dsp technique; input power factor correction; wide input voltage tolerance range; pure sine wave output; excellent dynamic response for step load change; static and manual bypass; hot stand-by/redundancy option; lcd/led display; monitoring software/snmp; easy installation, use and maintenance; superior performance to price analysis; and country wide support centres.